Welcome. IMHO. Go with the stereo.
1- More people get to enjoy them.
2- You see them all the time when you and friends and family are riding the Hummer, better value thru maximum usage.
3- Many people don't know and don't like 20" wheels and Nitto tires, but thieves do know and like them.
4- Girls notice DVD, LVD, NAV, but generally not rims and tires. If your intention or goal is spend some quality time with her/them in your Hummer, you cannot do without DVD/LCD/NAV. You don't need 20" rims and tires to convince them.
5- One day you will sell your Hummer, buyers will be impressed with your Nav and DVD and LCD, most likely that will not be the case with 20" rim and nitto tires.
6- If you must have 20" rims and Nitto tires, fine, get them later, there gotta to be a higher mountain to climb, let the 20" rims be your next goal.
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